Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Reexamination Certificate
2000-07-24
2004-01-06
Ruhl, Dennis (Department: 3761)
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
C604S365000, C604S375000
Reexamination Certificate
active
06673983
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an absorbent composite and methods for making the same and, more particularly, to a unitary stratified composite having a first stratum and a second stratum integrally connected by a transition zone.
BACKGROUND OF THE INVENTION
Cellulose fibers derived from wood pulp are used in a variety of absorbent articles, for example, diapers, incontinence products, and feminine hygiene products. It is desirable for the absorbent articles to have a high absorbent capacity for liquid, as well as to have good dry and wet strength characteristics for durability in use and effective fluid management. In addition to absorbent capacity, the ability to rapidly absorb a liquid is a desirable characteristic of an absorbent article. For example, diapers and other hygienic products that do not contain a dedicated liquid acquisition component, suffer from liquid leakage and rewet (i.e., the feeling of dampness to touch after use). Hygienic products that contain only a high loft nonwoven acquisition layer suffer from a lack of fast temporary liquid storage capability and leakage. Hygienic products that contain cellulose-based acquisition layers suffer from rewet due to the temporary storage capability of the cellulose's fibers and lack of complete drainage. Further, cellulose-based acquisition materials have poor wet and dry integrity.
One solution to the problem of providing absorbent articles that possess the advantageous properties of high absorbent capacity, rapid liquid acquisition, reduced leakage, and superior rewet performance has been the production of absorbent articles that contain multiple layers. For example, the combination of one layer having rapid liquid acquisition characteristics with another layer having high absorbent capacity results in a product that offers the advantages of both strata. Some improvements in the performance of products that include multiple layers have been directed to the integration of the layers. Approaches to increased integration typically include methods of bonding one layer to the next. Increasing the commingling between, for example, a liquid acquisition layer and a liquid storage layer can increase fluid communication and the rate and drainage efficiency at which the acquisition layer releases liquid to the storage layer, thereby increasing the product's overall liquid containment capability.
Despite the advantages associated with multiply layered absorbent products, problems related to the effective layer-to-layer fluid communication of diverse materials, and the economic costs of producing, handling, and bonding individual component layers remain.
Accordingly, there exists a need for an integrated absorbent material that provides the dry feel and rapid liquid acquisition of a high-loft, nonwoven material, and rapid temporary storage capability and rapid liquid acquisition performance of cellulose fibers such as crosslinked cellulose pad. The present invention seeks to fulfill these needs and provides further related advantages.
REFERENCES:
patent: 3716449 (1973-02-01), Gatward et al.
patent: 3871952 (1975-03-01), Robertson
patent: 3938782 (1976-02-01), Robertson
patent: 4129132 (1978-12-01), Butterworth et al.
patent: 4145464 (1979-03-01), McConnell et al.
patent: 4223677 (1980-09-01), Anderson
patent: 4354901 (1982-10-01), Kopolow
patent: 4355066 (1982-10-01), Newman
patent: 4364992 (1982-12-01), Ito et al.
patent: 4443297 (1984-04-01), Cheshire et al.
patent: 4551142 (1985-11-01), Kopolow
patent: 4559050 (1985-12-01), Iskra
patent: 4605401 (1986-08-01), Chmelir et al.
patent: 4704112 (1987-11-01), Suzuki et al.
patent: 4723954 (1988-02-01), Pieniak
patent: 4798603 (1989-01-01), Meyer et al.
patent: 4826498 (1989-05-01), Kocazb
patent: 4859527 (1989-08-01), DiStefano
patent: 4883707 (1989-11-01), Newkirk
patent: 4885204 (1989-12-01), Bither et al.
patent: 4963230 (1990-10-01), Kawase et al.
patent: 4988344 (1991-01-01), Reising et al.
patent: 4988345 (1991-01-01), Reising
patent: 5017426 (1991-05-01), Greiser et al.
patent: 5037409 (1991-08-01), Chen et al.
patent: 5061259 (1991-10-01), Goldman et al.
patent: 5102597 (1992-04-01), Roe et al.
patent: 5134007 (1992-07-01), Reising et al.
patent: 5147343 (1992-09-01), Kellenberger
patent: 5147345 (1992-09-01), Young et al.
patent: 5147505 (1992-09-01), Altman
patent: 5149335 (1992-09-01), Kellenberger et al.
patent: 5164045 (1992-11-01), Awofeso et al.
patent: 5178729 (1993-01-01), Janda
patent: 5188624 (1993-02-01), Young, Sr. et al.
patent: 5204173 (1993-04-01), Canary
patent: 5217445 (1993-06-01), Young et al.
patent: 5225047 (1993-07-01), Graef et al.
patent: 5227023 (1993-07-01), Pounder et al.
patent: 5271987 (1993-12-01), Iskra
patent: 5277915 (1994-01-01), Provonchee et al.
patent: 5281207 (1994-01-01), Chmielewski et al.
patent: 5284610 (1994-02-01), Tai
patent: 5290269 (1994-03-01), Heiman
patent: 5294478 (1994-03-01), Wanek et al.
patent: 5296290 (1994-03-01), Brassington
patent: 5324561 (1994-06-01), Rezai et al.
patent: 5330822 (1994-07-01), Berg et al.
patent: 5348547 (1994-09-01), Payne et al.
patent: 5350370 (1994-09-01), Jackson et al.
patent: 5354290 (1994-10-01), Gross
patent: 5360420 (1994-11-01), Cook et al.
patent: 5364382 (1994-11-01), Latimer et al.
patent: 5372877 (1994-12-01), Kannenkeril
patent: 5409572 (1995-04-01), Kershaw et al.
patent: 5415643 (1995-05-01), Kolb
patent: 5422169 (1995-06-01), Roe
patent: 5425725 (1995-06-01), Tanzer et al.
patent: 5429629 (1995-07-01), Latimer et al.
patent: 5433715 (1995-07-01), Tanzer et al.
patent: 5466513 (1995-11-01), Wanek et al.
patent: 5486167 (1996-01-01), Dragoo et al.
patent: 5494554 (1996-02-01), Edwards et al.
patent: 5505718 (1996-04-01), Roe et al.
patent: 5522810 (1996-06-01), Allen, Jr. et al.
patent: H1565 (1996-07-01), Brodof et al.
patent: 5531728 (1996-07-01), Lash
patent: 5556392 (1996-09-01), Kocazb
patent: 5562646 (1996-10-01), Goldman et al.
patent: 5597873 (1997-01-01), Chambers et al.
patent: 5599335 (1997-02-01), Goldman et al.
patent: 5601542 (1997-02-01), Melius et al.
patent: 5607550 (1997-03-01), Akers
patent: 5629069 (1997-05-01), Hamajima et al.
patent: 5637105 (1997-06-01), Tanaka et al.
patent: 5645542 (1997-07-01), Anjur et al.
patent: 5651862 (1997-07-01), Anderson et al.
patent: 5653702 (1997-08-01), Brohammer et al.
patent: 5669894 (1997-09-01), Goldman et al.
patent: 5698078 (1997-12-01), Mizukami et al.
patent: 5728081 (1998-03-01), Baer et al.
patent: H1724 (1998-04-01), Ahr
patent: 5795439 (1998-08-01), Euripides et al.
patent: 5820973 (1998-10-01), Dodge, II et al.
patent: 5821179 (1998-10-01), Masaki et al.
patent: 5830202 (1998-11-01), Bogdanski et al.
patent: 5836929 (1998-11-01), Bewick-Sonntag et al.
patent: 5843059 (1998-12-01), Niemeyer et al.
patent: 5843063 (1998-12-01), Anderson et al.
patent: 5843575 (1998-12-01), Wang et al.
patent: 5843852 (1998-12-01), Dutkiewicz et al.
patent: 5849000 (1998-12-01), Anjur et al.
patent: 5849405 (1998-12-01), Wang et al.
patent: 5851672 (1998-12-01), Wang et al.
patent: 5853867 (1998-12-01), Harada et al.
patent: 5855572 (1999-01-01), Schmidt
patent: 5858535 (1999-01-01), Wang et al.
patent: 5868724 (1999-02-01), Dierckes, Jr. et al.
patent: 5873867 (1999-02-01), Coles et al.
patent: 5879344 (1999-03-01), Koczab
patent: 5891119 (1999-04-01), Te et al.
patent: 5891120 (1999-04-01), Chmielewski
patent: 5941862 (1999-08-01), Haynes et al.
patent: 5944706 (1999-08-01), Palumbo et al.
patent: 5961506 (1999-10-01), Guidotti et al.
patent: 5972487 (1999-10-01), Duenk et al.
patent: 5977014 (1999-11-01), Plischke et al.
patent: 5998511 (1999-12-01), Westland et al.
patent: 6011195 (2000-01-01), Muhs et al.
patent: 6020536 (2000-02-01), Österdahl et al.
patent: 6022818 (2000-02-01), Welchel et al.
patent: 6037518 (2000-03-01), Guidotti et al.
patent: 6080909 (2000-06-01), Osterdahl et al.
patent: 6152904 (2000-11-01), Matthew et al.
patent: 0 262 817 (1988-06-01), None
patent: 0 339 461 (1989-02-01), None
patent: 0 528 248 (1993-02-01), None
patent: 0 437 816 (1995-07-01), None
patent:
Bunker Daniel T.
Elston Colin
Graef Peter A.
Howard Fred B.
Mathews Jeffrey D.
Christensen O′Connor Johnson Kindness PLLC
Ruhl Dennis
Weyerhaeuser Company
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